Volunteer corn management can be unique compared to traditional weed management. A couple of reasons why volunteer corn should be controlled include:
Volunteer plants are a refuge for corn rootworm populations.
Dockage at the elevator can occur if the soybean sample is contaminated with corn kernels.
Herbicide tolerance traits of the previous corn product is a key consideration in managing volunteer corn plants. Rotating to a soybean crop may seem easier because of additional herbicide options; however, the effectiveness of the herbicides should be considered. Many corn products have traits that tolerate glyphosate, glufosinate or both. Additionally, volunteer corn is quite tolerant to dicamba and 2,4-D. An in-season herbicide specific to volunteer corn control should be added to the soybean herbicide system. Many soil-applied herbicides for soybean can control volunteer corn; however, consideration should be given to the potential effect they may have on the succeeding corn crop.
Performance may vary, from location to location and from year to year, as local growing, soil and weather conditions may vary. Growers should evaluate data from multiple locations and years whenever possible and should consider the impacts of these conditions on the grower’s fields.
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